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The new discover mechanic is one of the planeswalkers abilities where you can exile until you get a nonland card that is 4 mana value or less

An ideal deck would have three copies of each of these cards

Creepshow Full disclosure: I was so mad when I saw these Lairs previewed

As R&D learned in earlier sets, if you have an activation with colored mana, you can turn that activation to hybrid mana

You can destroy any number of monsters your opponent controls equal to the number of Level 5 or higher WATER monsters you control, but it provides a nasty kick - after the destruction effect, it completely drowns out the spots until the end of the next turn, effectively shutting your opponent out if the conditions are just right